El_Perro:edmo: You can always tell a bloated agency by what they spend their time on.

If you've ever seen the area where he planted these flowers, you'd understand. They're planted in a steep cobblestone embankment, alongside the top of one of the longest escalators in the Metro system. Allowing him to tend to the flowers is a lawsuit waiting to happen (especially since he informed them, in writing, of his intent to tend to the flowers)

Send him a legalese letter informing him they aren't responsible for injuries or problems caused by his activities, book it, done.

I could see this being a security issue. If you're driving along the road in Afghanistan and see that someone has randomly dug up the side of the road to plant flowers, there's a good chance they put a bomb under them. If the metro police are being paranoid, they could think think this guy was plotting something similar at a major mass transit point.